"Disk group has no valid configuration copies" appears due to mixed matching, and mismatching, UDID values, resulting in a disk group import failure, following an upgrade to 5.1, or above
Article ID: 100026167
Updated On:
Description
Error Message
#vxdg import testdg
VxVM vxdg ERROR V-5-1-10978 Disk group testdg: import failed:
Disk group has no valid configuration copies
Cause
This behavior may occur if the udid and the udid_asl are mismatched. In some cases, this occurs due to changes that are made to the udids during storage upgrades.
Note: This error has many possible causes, including disk read, or write, failures and private region corruption. This article is specific to the conditions caused by UDIDs.
Storage Foundation 5.x and 6.x checks the unique disk identifier (UDID) value that is known to the Device Discovery Layer (DDL) against the UDID value that is set in the private region of the disk.
The udid_mismatch flag is set on the disk if the values differ.
Example 1 - A disk that does not have the udid_mismatch flag set
#vxdisk -v list c3t50060E80004372C0d0s2 Device: c3t50060E80004372C0d0s2 devicetag: c3t50060E80004372C0d0.... udid: HITACHI%5FDF600F%5FD600101C%5F00EF .....Annotations: tag udid_asl=HITACHI%5FDF600F%5FD600101C%5F00EF Multipathing information: numpaths: 1 c3t50060E80004372C0d0s2 state=enabled type=primary |
Example 2 - A disk that has the udid_mismatch flag set
#vxdisk -v list c2t50060E800543CB21d0s2 Device: c2t50060E800543CB21d0s2 devicetag: c2t50060E800543CB21d0 .... udid: HITACHI%5FOPEN-V%20%20%20%20%20%20-SUN%5F043CB%5F1300 ..... Annotations: tag udid_asl=HITACHI%5FOPEN-V%20%20%20%20%20%20-SUN%5F04458%5F3800 |
Use this command to check the UDID for all of the disks in the system.
#vxdisk -q list | awk '{print $1}' | xargs -i vxdisk -v list {} | egrep '^Device|^disk:|^udid:|udid_asl' | sed 's/^udid: *//' | sed 's/.*udid_asl=//' | uniq -c
Example 3 - Using vxdisk to check for UDID mismatches
|
#vxdisk -q list | awk '{print $1}' | xargs -i vxdisk -v list {} | egrep '^Device|^disk:|^udid:|udid_asl' | sed 's/^udid: *//' | sed 's/.*udid_asl=//' | uniq -c
#vxdisk -q list |awk '{print $1}'| xargs -i vxdisk -v list {} | egrep '^Device|^disk:|^udid:|udid_asl' | sed 's/^udid: *//' | sed 's/.*udid_asl=//' | uniq -c
#vxdisk -q list |awk '{print $1}'| xargs -i vxdisk -v list {} | egrep '^Device|^disk:|^udid:|udid_asl' | sed 's/^udid: *//' | sed 's/.*udid_asl=//' | uniq -c 1 Device: c2t50060E800543CB21d0s2 |
Resolution
Additional information:
1. Verify that the disks are not actually duplicates. This may occur if cloned disks are presented to the same server as the original disks.
2. Save the current diskgroup configuration, as a precaution, by following the steps in this article:
https://supportinfoscale.cloud.com/support-home/kbsearch/article?articleNumber=100028435&articleTitle=using-vxconfigbackup-and-vxprivutil-to-back-up-up-the-disk-group-configuration-of-the-veritas-private-region#page=1
3. Use vxdisk to update the UDID:
#vxdisk <-f> updateudid
This uses the current value of the UDID which is stored in the Device Discovery Layer (DDL) database to correct the value in private region. The "-f" option may be specified if Storage Foundation has not raised the udid_mismatch flag for a disk.
Note: Storage Foundation 5.0 MP3 RP3, or above, is required to update the unique disk identifier (UDID).
4. Use vxdisk to set the "clone" flag to "off":
#vxdisk set clone=off
5. User vxdg to import the diskgroup:
#vxdg import
Note: For a disk group with a large number of disks, the following syntax may be used to process multiple disks at once.
Use vxdisk to collect a list of disks that belong the "problem" disk group into a temporary file:
#vxdisk -o alldgs list | grep | awk '{print $1}' > /tmp/list
Check the content of this file to ensure that it only contains disks that belong the "problem" disk group.
Correct the UDID, and turn-off the clone flag, using updateudid and vxdisk:
#for i in `cat /tmp/list`; do vxdisk updateudid $i; vxdisk set $i clone=off ; done
Issue/Introduction
Disk group fails to import and returns an error.
